simpson



(No Model.) 2 Sheets-Sheet l.

J. H. SIMPSON.

MANUFACTURE OF DRAW BARS.

No. 369,263. Patented Aug. 30, 1887.

(No Model.) 2 Sheets-Sheet 2.

J. H. SIMPSON. MANUPAGTURE 0F DRAW BARS. No. 369,263. Patented Aug. 30, 1887.

UNITED STATES PATENT Erica.

JAMES H. sinrson, or PITTSBURG, PENNsYLvANIA, ASSIGNOR TO GARNE- GIE, PHIPPS & 00., Lauren or SAME PLAon.

MANUFACTURE OF DRAW-BARS.

SPECIFICATION forming part of Letters Patent No. 369,263 dated August 30, 1887.

Application filed February 1, 1887.

To all whom it may concern:

Be it known that I, JAuEs H. SIMPSON, of Pittsburg,in the county of Allegheny and State of Pennsylvania, have invented a new and usefnl Improvement in the Manufacture 01 Draw- Bars; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to an improvement in the manufacture of draw-bars of the kind IO shown in Figure 6 of the accompanying drawings; and it consists in forming a blank comprising the straps and rear end piece of the draw-bar, the free ends of the straps being provided with shoulders or stems, then setting I5 a ring or head-blank on these shoulders or stems and there confining it by welding, and then shaping up the head.

It also consists in the construction and operation of certain dies which I have devised for these purposes.

The invention is illustrated in the accompanying drawings, in which- Fig. l is a plan view of the die-block used in my improved manufacture. Fig. 2 is a vertieal cross-section of the complete bed-die, the section being on the line :0 mof Fig. 1. Fig. 3 is also a vertical crosssection of the completed bed-die, the sectionplane being on the line 3/ g of Fig. 2 and at right angles to the sectional 3o plane of that figure. Fig. 4: is a perspective sectional view of the plunger or moving die. Fig. 5 is a perspective plan view of the matrix or bed-die. Fig. 6 is a perspective view of the completed draw-bar. Fig. 7 is a perspective view of the blanks constituting the straps and head or ring of the draw-bar before they are united together, the ring being partly broken away to illustrate more clearly the mode of manufacture. Fig. Sis a vertical lon- 0 gitudinal section of the parts shown in Fig. 7. Fig. 9 is a perspective view showing the ringblank for the draw-bar head in an incomplete state. Fig. 10 is a plan view of a part of the ring-blank adapted to be set on the draw-bar straps. Figs. 11, 12, 13, 14, 15, and 16 are de tail views illustrating the-forms of my improve ment, which I claim herein specifically.

Like symbols of reference indicate like parts in each. A

My invention consists in the construction of Serial No. 226,167. (No model.)

certain dies which I use in the manufacture of draw-bars, and in a certain mode of uniting the parts of draw-bars, which adapts them to be finally welded together by the dies. These modes are illustrated in Figsll to 16, inclusive; but in order that my invention may be better understood, so far as it relates to the dies, I will first describe an analogous and closely-related method, (illustrated in Figs. 7, S, and 9,) which I do not claim herein specifically, but which is described and shown in an applica tion filed by me on May 28, 1887, wherein this related method is claimed specifically and wherein is also contained a broad claim cov ering, generically, that method, and also the method which I claim specifically in the present specification. In that method I first form a blank, A, Figs. 7 and S, in form of a sub-.- stantially-reotangular fork, having two side bars or straps, a a, and an end piece, at, connecting these straps. This blank forms the body or shank of the draw-bar. The free ends of the straps c a have on their outer sides recesses or shoulders b, above the bases of which the ends of the straps extend to form stems 1), preferably of curved or irregular form. The blank is thickened up at a" near its ends to strengthen it. The head of the draw-bar is constituted by a ring-blank, c, of the usual oval outline, whoseinner periphery is provided with lateral notches or recesses c, Fig. 10,which are substantial counterparts of the stems b, which form the sides of the recesses b. The ring a is made by lap-welding and shaping a metal bar, as shown in Fig. 9, and then punch-v ing out or otherwise forming the recesses c. The ring thus made is set on the shoulders I) of the straps a a, the ends of which then project above the ring, as shown in Figs. 7 and 8. I then prefer to upset the end of one or both of the straps, as shown at the upper end of the strap a, Fig. 8, to confine the ring in positionduring the succeeding steps.

The remaining steps in the manufacture eonsist in the upsetting and welding of the ends of the straps down onto the ring, welding the ring to the straps in the recesses b,and.fiually shaping the ring to form the draw-bar head. This I do by the dies shown on the first sheet of the drawings. As shown in Figs. 2, 3, and I00 5, the surface of the bed-die is shaped to correspond with the form of the under side of the finished draw-bar head, and in the center is a vertical hole, c,in which the shank of the drawbar fits. A casing or box, f, is shrunk around the upper parts of the die-block d. d are lugs or stops at the side of the die-block, arranged to limit the motion of the moving die. The die-block d sets within a recess on the surface of abed-block, g, and is there held by a removable key, 9. The block 9 is provided with a horizontal hole passing through the block and intersecting the vertical hole 6. WVhen the draw-bar is set in position in the die, a key-bar, h, is put through this horizontal hole and through the space between the straps of the draw-bar. The function of this key is to confine the draw-bar and die-box and to prevent it from moving upward with the plunger or moving die. The moving (lie or plunger j is fixed to the end of a vertically-reciprocating steam-hammer stock or drop. It has a central tongue, is, which is adapted to enter through the ring 0 into the space between the straps a a and lateral flanges m, whose under surfaces are, as shown in Fig. 4, shaped so as to be counterparts of the surface of the head of the finished draw-bar. After the blanks A and 0 have been put together, as shown in Fig. 7, they are put,when ata welding heat, into the bed-die, the shank A fitting into the hole 0 and the ring a resting upon the surface of the beddie. The key h is then inserted into the hole in the block 9, through the space between the straps of the draw-bar, the tongue of the moving die enters through the ringc into the space between the straps, and the flanges m of the moving die upset the projecting ends or stems I) of the straps a a, making them flat with the ring, and the compression of the ring and straps between the bed-die and plunger welds the ring and straps together, and causes them to assume the finished shape shown in Fig. 6. The key h holds the draw-bar, and enables the moving die to be retracted without sticking to the blank. To remove the drawbar from the die (I after the withdrawal of the moving die, the key 9 is removed, and the easingf,with its contained die,is taken out of the bed block 9. For this purpose a side of the re* cess of the block 9, in which the die is set, and a side of the hole 6 is left open, as shown in Fig. 1, so that the whole casing fmay be drawn out laterally. When drawn out, the casing f, which carries the draw-bar, is partially supported by a chain hooked onto a handle, f. The casing is then inverted, and a few strokes of ahammer on the end of the draw-bar will dislodge it. This feature of my invention is important, because otherwise the draw-bar would be diffieult to remove. By use of these dies the parts of the draw-bar are very firmly united at one operation. The cost of manufacture is small, and the finished draw-bar is very durable and serviceable.

Ishall now describe my present invention as shown in Figs. 11, 12, 13, 14,15, and 16. In these figures the stem 1), which prevents the head-blank c from lateral displacement on the draw-bar, is not constituted by an integral part of the draw-bar blank, but consists in a pin, 1), which is driven through a hole,0, in the ring-blank and into the end of thebodyblank straps. The ring-blank is seated directly on the flat ends of the straps of the body-blank, which act in the same way as do the shoulders I) in Figs. 7 and 8, andthe holes 0 are preferably punched in the head-blank before it is fitted on the body-blank. These pins may be plain cylindrical pins, as shown in Fig. 13, in which case holes 0 are punched in the ends of the straps before the parts are fitted together; or, as shown in Fig. 12, the pins may be driven into the straps while they are at welding heat. When this is done, the ends of the pins are preferably bifurcated, as

shown in Fig. 14, so that when driven into the body of the straps they shall spread, as shown in Fig. 12, and thus make a very secure union. In the modified form of pin shown in Fig. 15 they are made in two sections, which, when put side to side, constitute a single pin, like that ofFig. 14. When the parts of the blank have been thus fitted together, they are put into the dies shown on the first sheet of the drawings, and the descent of the moving-die upsets the ends of the pins, flattening them down upon the headblank, and at the same'time welding the pins and the blanks together.

I claim-- 1. A die for the manufacture of draw-bars,

consisting in the combination of a bed-die, d, having a surface corresponding in contour with the under side of the draw-bar head and a cavity for the shank of the draw-bar, and a plunger having a tongue adapted to enter the space between the straps of the draw -bar, and a flange whose under surface corresponds with the contour of the outer side of the drawbar head, substantially as and for thepurposes described.

2. The die d, having a central opening for the draw-bar, in combination with a bedblock, 9, having a hole, 6, for the shank of the draw-bar, and a recess for receiving the die, said recess and hole 0 being open at the side to permit lateral withdrawal of the die and draw-bar, substantially as and for the purposes described.

3. The die d, having a central opening for the draw-bar, in combination with a bedblock, having a hole, 6, for the shank of the draw-bar, a recess for receiving the die, said recess and hole 6 being open at the side to permit lateral withdrawal of the die and draw-bar, and a key, h, arranged to enter the die-block and to fit between the straps of the draw-bar, substantially as and for the purposes described.

4. An improvement in the art of making into the body-blank when thelatter is heated, draw-bars, which consists in forming a bodyand finally welding the blanks together, subblank, A, and a head-blank, c, securing the stantially as and for the purposes described. blanks together by pins, and finally welding In testimony whereof I have hereunto set 5 the blanks together, substantially as and for my hand this 28th day of January, A. D. 1887. 15

the purposes described. J 1

5. An improvement in the art of making JAMES SIMPbON' draw-bars, which consists in forming a body- Witnesses: blank, A, and a head-blank, 0, driving a pin \V. B. CORWIN, to with a forked end through the headblank THOMAS W. BAKEWELL. 

